G.f. satisfies A(x) = 1 + Sum_{n>=1} x^n * A(x)^prime(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =46a(5) =208a(6) =993a(7) =4932a(8) =25246a(9) =132327a(10) =706936a(11) =3836187a(12) =21090069a(13) =117230109a(14) =657797920a(15) =3721215175a(16) =21201525478a(17) =121554438782a(18) =700793218421